evm.h 1.8 KB
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/*
 * Copyright (C) 2005-2010 IBM Corporation
 *
 * Authors:
 * Mimi Zohar <zohar@us.ibm.com>
 * Kylene Hall <kjhall@us.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2 of the License.
 *
 * File: evm.h
 *
 */
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#ifndef __INTEGRITY_EVM_H
#define __INTEGRITY_EVM_H

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#include <linux/xattr.h>
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#include <linux/security.h>
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#include "../integrity.h"

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#define EVM_INIT_HMAC	0x0001
#define EVM_INIT_X509	0x0002
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#define EVM_ALLOW_METADATA_WRITES	0x0004
#define EVM_SETUP_COMPLETE 0x80000000 /* userland has signaled key load */
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#define EVM_KEY_MASK (EVM_INIT_HMAC | EVM_INIT_X509)
#define EVM_INIT_MASK (EVM_INIT_HMAC | EVM_INIT_X509 | EVM_SETUP_COMPLETE | \
		       EVM_ALLOW_METADATA_WRITES)
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struct xattr_list {
	struct list_head list;
	char *name;
};

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extern int evm_initialized;
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#define EVM_ATTR_FSUUID		0x0001

extern int evm_hmac_attrs;
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extern struct crypto_shash *hmac_tfm;
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extern struct crypto_shash *hash_tfm;
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/* List of EVM protected security xattrs */
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extern struct list_head evm_config_xattrnames;
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struct evm_digest {
	struct ima_digest_data hdr;
	char digest[IMA_MAX_DIGEST_SIZE];
} __packed;

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int evm_init_key(void);
int evm_update_evmxattr(struct dentry *dentry,
			const char *req_xattr_name,
			const char *req_xattr_value,
			size_t req_xattr_value_len);
int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
		  const char *req_xattr_value,
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		  size_t req_xattr_value_len, struct evm_digest *data);
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int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
		  const char *req_xattr_value,
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		  size_t req_xattr_value_len, char type,
		  struct evm_digest *data);
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int evm_init_hmac(struct inode *inode, const struct xattr *xattr,
		  char *hmac_val);
int evm_init_secfs(void);
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#endif